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Pneumatic Tire

a technology of pneumatic tires and treads, which is applied in the field of pneumatic tires, can solve the problems of reducing the strength of the tread portion, difficulty in ensuring shock burst resistance performance, and foreign material being likely to penetrate the ground contact surfa

Pending Publication Date: 2021-09-23
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present technology is providing a pneumatic tire that can offer both wet braking performance and shock burst resistance performance in a compatible manner. This means that the tire can successfully provide both functions simultaneously.

Problems solved by technology

However, an excessively increased groove area is likely to reduce the strength of the tread portion, and thus in a case where the ground contact surface treads on a foreign material on the road surface, the foreign material is likely to penetrate the ground contact surface.
This leads to difficulty in ensuring shock burst resistance performance against a shock burst occurring in a case where the foreign material is stepped on.
Thus, it has been very difficult to ensure shock burst resistance performance while maintaining wet braking performance.

Method used

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  • Pneumatic Tire
  • Pneumatic Tire
  • Pneumatic Tire

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0030]Herein, “tire radial direction” refers to the direction orthogonal to the tire rotation axis (not illustrated) which is the rotation axis of a pneumatic tire 1. “Inner side in the tire radial direction” refers to a side toward the tire rotation axis in the tire radial direction. “Outer side in the tire radial direction” refers to a side away from the tire rotation axis in the tire radial direction. “Tire circumferential direction” refers to the circumferential direction with the tire rotation axis as the center axis. Additionally, “tire width direction” refers to a direction parallel with the tire rotation axis. “Inner side in the tire width direction” refers to a side toward a tire equatorial plane (tire equator line) CL in the tire width direction. “Outer side in the tire width direction” refers to a side away from the tire equatorial plane CL in the tire width direction. “Tire equatorial plane CL” refers to a plane that is orthogonal to the tire rotation axis and that passe...

second embodiment

[0097]The pneumatic tire 1 according to the second embodiment has a configuration substantially similar to that of the pneumatic tire 1 according to the first embodiment, but includes side reinforcing rubber 60 in the sidewall portion 8. The other components of the second embodiment are similar to the corresponding components of the first embodiment. Thus, descriptions thereof will be omitted, and the components are denoted by the same reference signs.

[0098]FIG. 11 is a meridian cross-sectional view illustrating a main portion of the pneumatic tire 1 according to the second embodiment. As in the case of the pneumatic tire 1 according to the first embodiment, in the pneumatic tire 1 according to the second embodiment, the relationship between the tire average thickness Gc in the center region Tc of the tread portion 2 and the tire average thickness Gsh in the shoulder region Tsh of the tread portion 2 is within the range of 1.05≤(Gc / Gsh)≤1.35. Additionally, the relationship between t...

modified examples

[0105]Note that, in the first embodiment described above, in the chamfered sipes 41 formed in the center land portion 21 and located in the center region Tc and in the chamfered sipes 51 formed in the shoulder land portion 23 and located in the shoulder region Tsh, the chamfered portions 45 and 55 are each formed as a surface connecting the ground contact surface 3 and the corresponding one of the sipe walls 47 and 57, but that the chamfered portions 45 and 55 may each be formed in any other shape. FIG. 12 is an explanatory diagram illustrating a modified example of the pneumatic tire 1 according to the first embodiment in which the chamfered portion 45 is formed from two surfaces. For example, as illustrated in FIG. 12, the chamfered portion 45 of each of the chamfered sipes 41 formed in the center land portion 21 may be formed by connecting the ground contact surface 3 and the sipe wall 47 by a plurality of planes. In other words, the chamfered portion 45 may be formed in a steppe...

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Abstract

In a tread portion of a pneumatic tire, an average lateral groove width Lc of a center region is obtained by dividing the groove area of lateral grooves in the center region by a circumferential length of the center region, and an average lateral groove width Lsh of a shoulder region is obtained by dividing the groove area of lateral grooves in the shoulder region by a circumferential length of the shoulder region. A relationship between a tire average thickness Gc of the center region and a tire average thickness Gsh in the shoulder region satisfies 1.05≤(Gc / Gsh)≤1.35, a relationship between the average lateral groove width Lc of the center region and the tire average thickness Gc in the center region satisfies 0.07≤(Lc / Gc)≤0.12, and a relationship between the average lateral groove width Lsh of the shoulder region and the tire average thickness Gsh in the shoulder region satisfies 0.17≤(Lsh / Gsh)≤0.26.

Description

TECHNICAL FIELD[0001]The present technology relates to a pneumatic tire.BACKGROUND ART[0002]Some known pneumatic tires have specified dimensions at predetermined positions to ensure desired performance. For example, in the pneumatic tire described in Japan Patent No. 5567839, the diameter growth of a tread portion is suppressed, by specifying the ratio between a distance, the distance between the end portion of a belt layer and the outermost edge of a carcass, and a tread width. Additionally, in a run-flat radial tire described in Japan Unexamined Patent Publication No. 2015-205583, rim disengagement is suppressed by specifying the ratio between an overlapping width in the tire axial direction, the overlapping width between a maximum width belt layer and a side reinforcing rubber layer, and a tire cross-sectional height.[0003]Here, wet braking performance, which indicates braking performance on wet road surfaces, is a type of performance required for the pneumatic tire. An example o...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60C11/03B60C11/12
CPCB60C11/0304B60C11/1236B60C2011/1213B60C11/1204B60C2011/0365B60C11/1272B60C11/0306B60C11/04B60C2011/036B60C2011/0367B60C2011/1209B60C11/1392B60C2011/0381B60C11/01B60C2011/0033B60C11/1259B60C9/28B60C11/1281
Inventor SHIMIZU, MASATOSHI
Owner THE YOKOHAMA RUBBER CO LTD